A detection switch system for video operation modules included a first video operation module, a second video operation module, a switch, an image data source and a detection module for operation loading. When an operation loading needed is less than a first critical operation loading of the first video operation module, the detection module for operation loading switches the switch to electrically connect with the first video operation module, and the image data source sends an image data to be operated to the first video operation module. When an operation loading needed is greater than the first critical operation loading of the first video operation module, the detection module for operation loading switches the switch to electrically connect with the second video operation module, and the image data source sends the image data to be operated to the second video operation module.